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z80 bugs #48

@jscrane

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@jscrane
64K CP/M Vers. 2.2 (Z80 CBIOS V1.2 for Z80SIM, Copyright 1988-2007 by Udo Munk)

A>d:
D>zexdoc
Z80 instruction exerciser
...
ld <bcdexya>,<bcdexya>........  ERROR **** crc expected:478ba36b found:8088c9d9
...

A page which mentions this group of tests. This group of tests also crashes cpmsim:

ld <bcdexya>,<bcdexya>........(  6,912) cycles 
E (37088206) core: Op-code trap at 0x2547 0xdd 0x40
I/O ran for 93890 ms, waited for 0 ms

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